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(approximately 40-50 miles). Depending on sampling conditions for each trip, a combination of the following sampling gear types will be utilized to catch adult/juvenile fish: boat electrofishing, backpack electrofishing, seining, and trammel nets. During higher flows, boat electrofishing will be utilized for runs and riffles (proceeding in a downstream direction), and where possible in backwaters and eddies. When flows do not permit boat electrofishing, a backpack electrofishing unit will be used to sample the main channel, runs, and riffles (sampling will proceed in an upstream direction), and where possible in backwaters and eddies. Seining and trammel nets will be completed in low-velocity habitats (e.g., backwaters, side channels, etc.), eddies, and riffles not conducive to electrofishing or where capture efficiency (as compared to electrofishing) will not be jeopardized. If possible, at least one sampling method will be used in the same locations during every sampling trip to allow direct comparisons between trips (e.g., trammel netting), All native fishes will be measured (TL in mm), weighed (nearest g), and released; a subsample of nonnative fishes will be measured and weighed and the remaining fish will only be counted. All endangered fish encountered will be PIT-tagged. Nonnative fishes need to be adequately monitored during this survey in the Price River in order to determine if the Price River is a potential source population for nonnative fishes in the Green River. During the April sampling trip, stations will be established based on geomorphology, habitat, fish distribution, accessibility and logistics. We will chose the stations to provide a representative overview of the river. Two or three stations will be established between Grassy trail Creek and Woodside, UT and 2 stations will be established between Woodside, UT and the confluence with the Green River (one directly below Woodside and one directly upstream from and including the confluence) . After flows have receded and the river is unnavigatable, only the established stations will be monitored each month until September. Obiective 2. The Price River will be sampled in conjunction with post-spawn adult/juvenile sampling trips. Seining will be conducted in low-velocity areas (e.g., side channels, isolated pools, backwaters) within all the monitoring stations. Light traps will be utilized in the two stations between Woodside, UT and the confluence with the Green River. All age-O fish that can not be identified will be preserved and identified at a later date. Obiective 3. The lower Price River will be sampled at least monthly from April-September (in conjunction with Objectives 1, 2, and 4) . Additional sampling trips will be completed on the lower Price River during 1) the ascending and descendin9 limb of the spring hydrograph to determine pre- and post-spawn use by mainstem adult endangered fishes and 2) during larval drift periods to determine if larval endangered fishes utilize the lower Price River. If there is no evidence of spawning in the upstream reaches of the Price River, any larval utilization in the lower Price River will be attributed to drift from Deso/Gray. Obiective 4. Physical habitat attributes will be measured at each monitoring station for each sampling trip. These measurements will include ~) an ocular habitat survey of the entire monitoring reach to identify the range of habitats that exist, potential spawning areas, nursery habitats and potential barriers to movement and 2) measurements of velocity, depth, substrate, water temperature, water clarity and DO. To address additional chemical attributes, water samples will be collected and analyzed from two locations: 1) near Grassy trail Creek and 2) near woodside. These samples will be collected in late summer (e_g,. August or September) during low flows. Chemical standards will be based on EPA water quality standards and information assimilated from the literature (Objective 5). Biological data collected will consist of